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CONSTRUCTION METHOD FOR CONNECTING BIFURCATED SECTION OF SHIELD TUNNEL, AND SHIELD TUNNEL STRUCTURE USING THE CONSTRUCTION METHOD
CONSTRUCTION METHOD FOR CONNECTING BIFURCATED SECTION OF SHIELD TUNNEL, AND SHIELD TUNNEL STRUCTURE USING THE CONSTRUCTION METHOD
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机译:盾构隧道断面连接的施工方法及采用该方法的盾构隧道结构
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摘要
PROBLEM TO BE SOLVED: To enhance safety in the execution of work and reduce a construction period and construction costs, by enabling a bifurcated section to be surely connected in ground, without using a cut and cover tunneling method etc. concurrently employing an auxiliary construction method, or securing the great length of a merging section; and to enable construction to be surely performed even under high water pressure.;SOLUTION: Branch-line tunnels 4 are constituted as three circular tunnels wherein two tunnel structures 10 with a diameter smaller than that of the branch-line tunnel 4 are annexed so that the positional relationship of bringing respective outer peripheral walls of the branch-line tunnels 4 and the two tunnel structures 10 into almost concurrent and partial contact with an outer peripheral wall of a main-line tunnel 2 at the point of merging with the main-line tunnel 2 can be established. After freezing treatment is applied to a section where the outer peripheral wall of the main-line tunnel 2 and the respective outer peripheral walls of the two tunnel structures 10 come into contact with one another, at a point where the maine-line tunnel 2 merges with the three circular tunnels, an opening communication section is opened by removing opposed wall sections of the main-line tunnel 2 and the branch-line tunnel 4.;COPYRIGHT: (C)2006,JPO&NCIPI
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